Final answer:
Insufflation of the abdomen is achieved with the use of the diaphragm.
Step-by-step explanation:
Insufflation of the abdomen is achieved with the use of the diaphragm. The diaphragm is a large muscle below the lungs that separates the thoracic and abdominal cavities. When the diaphragm contracts, it causes the expansion of the thoracic cavity and pushes the contents of the abdomen downward. This creates the necessary pressure to inflate the abdomen during processes such as defecation, urination, and childbirth.